I think guns are the issue. In Australia we changed our gun laws after the Port Arthur massacre, and there was a huge buy-back.
Our strict gun laws have saved thousands or Australian lives - look at the statistics. Much, much lower rate of murders and suicides after the change in legislation and the confiscations.
Yes, mentally ill people need health services. But all people need to live in a society where ordinary people don't get access to weapons. Farmers need them on farms, to put animalks out of their misery on occasion, anyone else should just go and lease them in a rifle range if they want to play with them. There is no reason for people to have them in their homes.